| 
                 
                    Closing price on 12/8/2015
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    29.30 | 
                 
                
                    | High | 
                    30.00 | 
                 
                
                    | Low | 
                    29.10 | 
                     
                
                    | Volume | 
                    168,410 | 
                                 
                
                    | Split-adjusted Price | 
                    18.33 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
NAF Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                12/8/2015
             | 
            
                +0.20 / +0.67%
             |             
            
                29.30
             |           
            
                30.00
             |               
            
                29.10
             |                           
            
                30.00
             | 
            
                29.71
             |                     
            
                18.33
             |                                 
            
                168,410
             |            
            
                 
             |                                       
         
    
        
            | 
                12/7/2015
             | 
            
                -0.40 / -1.32%
             |             
            
                30.00
             |           
            
                30.20
             |               
            
                29.70
             |                           
            
                29.80
             | 
            
                29.89
             |                     
            
                18.21
             |                                 
            
                145,290
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/4/2015
             | 
            
                -0.20 / -0.66%
             |             
            
                30.20
             |           
            
                30.40
             |               
            
                30.10
             |                           
            
                30.20
             | 
            
                30.23
             |                     
            
                18.46
             |                                 
            
                124,070
             |            
            
                 
             |                                       
         
    
        
            | 
                12/3/2015
             | 
            
                0.00 / 0.00%
             |             
            
                30.40
             |           
            
                30.70
             |               
            
                30.30
             |                           
            
                30.40
             | 
            
                30.41
             |                     
            
                18.58
             |                                 
            
                143,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/2/2015
             | 
            
                +0.60 / +2.01%
             |             
            
                30.10
             |           
            
                31.50
             |               
            
                29.90
             |                           
            
                30.40
             | 
            
                30.45
             |                     
            
                18.58
             |                                 
            
                276,250
             |            
            
                 
             |                                       
         
    
        
            | 
                12/1/2015
             | 
            
                -0.20 / -0.67%
             |             
            
                30.10
             |           
            
                30.40
             |               
            
                29.80
             |                           
            
                29.80
             | 
            
                30.06
             |                     
            
                18.21
             |                                 
            
                175,350
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/30/2015
             | 
            
                -0.10 / -0.33%
             |             
            
                30.80
             |           
            
                30.80
             |               
            
                29.80
             |                           
            
                30.00
             | 
            
                30.13
             |                     
            
                18.33
             |                                 
            
                217,650
             |            
            
                 
             |                                       
         
    
        
            | 
                11/27/2015
             | 
            
                -1.00 / -3.22%
             |             
            
                31.00
             |           
            
                31.20
             |               
            
                30.10
             |                           
            
                30.10
             | 
            
                30.81
             |                     
            
                18.39
             |                                 
            
                189,900
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/26/2015
             | 
            
                -0.40 / -1.27%
             |             
            
                31.40
             |           
            
                31.60
             |               
            
                31.10
             |                           
            
                31.10
             | 
            
                31.38
             |                     
            
                19.01
             |                                 
            
                206,450
             |            
            
                 
             |                                       
         
    
        
            | 
                11/25/2015
             | 
            
                +0.40 / +1.29%
             |             
            
                31.20
             |           
            
                31.90
             |               
            
                30.80
             |                           
            
                31.50
             | 
            
                31.33
             |                     
            
                19.25
             |                                 
            
                238,810
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/24/2015
             | 
            
                -0.30 / -0.96%
             |             
            
                31.00
             |           
            
                31.50
             |               
            
                31.00
             |                           
            
                31.10
             | 
            
                31.10
             |                     
            
                19.01
             |                                 
            
                160,510
             |            
            
                 
             |                                       
         
    
        
            | 
                11/23/2015
             | 
            
                -0.50 / -1.57%
             |             
            
                31.80
             |           
            
                32.00
             |               
            
                31.40
             |                           
            
                31.40
             | 
            
                31.68
             |                     
            
                19.19
             |                                 
            
                155,040
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/20/2015
             | 
            
                -0.30 / -0.93%
             |             
            
                32.20
             |           
            
                32.30
             |               
            
                31.90
             |                           
            
                31.90
             | 
            
                32.06
             |                     
            
                19.49
             |                                 
            
                242,410
             |            
            
                 
             |                                       
         
    
        
            | 
                11/19/2015
             | 
            
                -0.30 / -0.92%
             |             
            
                30.60
             |           
            
                32.70
             |               
            
                30.50
             |                           
            
                32.20
             | 
            
                32.26
             |                     
            
                19.68
             |                                 
            
                222,160
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/18/2015
             | 
            
                -0.20 / -0.61%
             |             
            
                32.70
             |           
            
                32.70
             |               
            
                31.90
             |                           
            
                32.50
             | 
            
                32.45
             |                     
            
                19.86
             |                                 
            
                219,660
             |            
            
                 
             |                                       
         
    
        
            | 
                11/17/2015
             | 
            
                -0.70 / -2.10%
             |             
            
                33.40
             |           
            
                33.40
             |               
            
                32.50
             |                           
            
                32.70
             | 
            
                33.07
             |                     
            
                19.98
             |                                 
            
                270,870
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/16/2015
             | 
            
                +1.40 / +4.38%
             |             
            
                32.50
             |           
            
                34.00
             |               
            
                32.50
             |                           
            
                33.40
             | 
            
                33.25
             |                     
            
                20.41
             |                                 
            
                367,630
             |            
            
                 
             |                                       
         
    
        
            | 
                11/13/2015
             | 
            
                +0.40 / +1.27%
             |             
            
                31.40
             |           
            
                32.20
             |               
            
                31.00
             |                           
            
                32.00
             | 
            
                31.78
             |                     
            
                19.56
             |                                 
            
                336,740
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/12/2015
             | 
            
                -0.10 / -0.32%
             |             
            
                31.60
             |           
            
                31.70
             |               
            
                31.00
             |                           
            
                31.60
             | 
            
                31.43
             |                     
            
                19.31
             |                                 
            
                222,860
             |            
            
                 
             |                                       
         
    
        
            | 
                11/11/2015
             | 
            
                0.00 / 0.00%
             |             
            
                31.60
             |           
            
                31.90
             |               
            
                31.50
             |                           
            
                31.70
             | 
            
                31.74
             |                     
            
                19.37
             |                                 
            
                220,380
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/10/2015
             | 
            
                +0.40 / +1.28%
             |             
            
                31.30
             |           
            
                31.90
             |               
            
                31.20
             |                           
            
                31.70
             | 
            
                31.53
             |                     
            
                19.37
             |                                 
            
                266,990
             |            
            
                 
             |                                       
         
    
        
            | 
                11/9/2015
             | 
            
                0.00 / 0.00%
             |             
            
                31.10
             |           
            
                31.50
             |               
            
                31.00
             |                           
            
                31.30
             | 
            
                31.23
             |                     
            
                19.13
             |                                 
            
                209,930
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/6/2015
             | 
            
                -0.50 / -1.57%
             |             
            
                31.10
             |           
            
                31.80
             |               
            
                31.10
             |                           
            
                31.30
             | 
            
                31.59
             |                     
            
                19.13
             |                                 
            
                223,140
             |            
            
                 
             |                                       
         
    
        
            | 
                11/5/2015
             | 
            
                +0.10 / +0.32%
             |             
            
                30.50
             |           
            
                32.00
             |               
            
                30.30
             |                           
            
                31.80
             | 
            
                31.77
             |                     
            
                19.43
             |                                 
            
                225,280
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/4/2015
             | 
            
                -0.30 / -0.94%
             |             
            
                30.50
             |           
            
                32.00
             |               
            
                30.50
             |                           
            
                31.70
             | 
            
                31.62
             |                     
            
                19.37
             |                                 
            
                232,220
             |            
            
                 
             |                                       
         
    
        
            | 
                11/3/2015
             | 
            
                +0.30 / +0.95%
             |             
            
                31.70
             |           
            
                32.50
             |               
            
                29.70
             |                           
            
                32.00
             | 
            
                31.65
             |                     
            
                19.56
             |                                 
            
                212,490
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/2/2015
             | 
            
                +2.00 / +6.73%
             |             
            
                30.10
             |           
            
                31.70
             |               
            
                30.10
             |                           
            
                31.70
             | 
            
                31.28
             |                     
            
                19.37
             |                                 
            
                211,810
             |            
            
                 
             |                                       
         
    
        
            | 
                10/30/2015
             | 
            
                +1.90 / +6.83%
             |             
            
                27.60
             |           
            
                29.70
             |               
            
                27.30
             |                           
            
                29.70
             | 
            
                29.31
             |                     
            
                18.15
             |                                 
            
                2,292,180
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/29/2015
             | 
            
                +0.90 / +3.35%
             |             
            
                26.90
             |           
            
                27.80
             |               
            
                26.90
             |                           
            
                27.80
             | 
            
                27.28
             |                     
            
                16.99
             |                                 
            
                221,300
             |            
            
                 
             |                                       
         
    
        
            | 
                10/28/2015
             | 
            
                -0.10 / -0.37%
             |             
            
                27.00
             |           
            
                27.20
             |               
            
                26.90
             |                           
            
                26.90
             | 
            
                27.01
             |                     
            
                16.44
             |                                 
            
                166,420
             |  
            
                 
             |                                                              
             
    
         
    
    
 |